Minify_Cache_File::fetch PHP Method

    public function fetch($id)
    {
        if (!$this->locking) {
            return file_get_contents($this->path . '/' . $id);
        }
        $fp = fopen($this->path . '/' . $id, 'rb');
        if (!$fp) {
            return false;
        }
        flock($fp, LOCK_SH);
        $ret = stream_get_contents($fp);
        flock($fp, LOCK_UN);
        fclose($fp);
        return $ret;
    }

function test_Minify_Cache_File()
{
    $data = str_repeat(md5(time()) . 'í', 100);
    // 3400 bytes in UTF-8
    $id = 'Minify_test_cache_noLock';
    $prefix = 'Minify_Cache_File : ';
    $cache = new Minify_Cache_File();
    echo "NOTE: Minify_Cache_File : path is set to: '" . $cache->getPath() . "'.\n";
    assertTrue(true === $cache->store($id, $data), $prefix . 'store');
    assertTrue(countBytes($data) === $cache->getSize($id), $prefix . 'getSize');
    assertTrue(true === $cache->isValid($id, $_SERVER['REQUEST_TIME'] - 10), $prefix . 'isValid');
    ob_start();
    $cache->display($id);
    $displayed = ob_get_contents();
    ob_end_clean();
    assertTrue($data === $displayed, $prefix . 'display');
    assertTrue($data === $cache->fetch($id), $prefix . 'fetch');
    // test with locks
    $id = 'Minify_test_cache_withLock';
    $cache = new Minify_Cache_File('', true);
    assertTrue(true === $cache->store($id, $data), $prefix . 'store w/ lock');
    assertTrue(countBytes($data) === $cache->getSize($id), $prefix . 'getSize');
    assertTrue(true === $cache->isValid($id, $_SERVER['REQUEST_TIME'] - 10), $prefix . 'isValid');
    ob_start();
    $cache->display($id);
    $displayed = ob_get_contents();
    ob_end_clean();
    assertTrue($data === $displayed, $prefix . 'display w/ lock');
    assertTrue($data === $cache->fetch($id), $prefix . 'fetch w/ lock');
}